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• Kira (Shadow of the Dragon) by Kate O'Hearn Hodder Children's Books Paperback 3 April 2008 from£6.99 | RRP: £6.99
• The Runaway Heiress (Harlequin Historical) by Anne O'Brien Harlequin Books Mass Market Paperback 1 August 2006 from£6.95 | RRP: £3.57
• Germany Since 1945 (Studies in Contemporary History) by Pol O'Dochartaigh Palgrave Macmillan Paperback 21 October 2003 from£28.99 | RRP: £19.99
• Global Village Idiot by John O'Farrell Doubleday Paperback 1 October 2001 from£14.83 | RRP: £10.99
• Eek! Stories to Make You Shriek: Bad Luck Penny (Eek! Number 4): Bad Luck Penny v. 4 by Jane O'Connor Macmillan Children's Books Paperback 11 June 1999 from£4.03 | RRP: £2.99
• An Introduction to the Philosophy of Science by Anthony O'Hear Clarendon Press Paperback 30 March 1989 from£45.47 | RRP: £23.99
• Language of Media and the Moving Image Student's Book (Literacy in Context) by John O'Connor Cambridge University Press Paperback 7 June 2001 from£10.12 | RRP: £6.95
• Country Girls by Edna O'Brien Weidenfeld & Nicolson Hardcover 4 June 1981 from£12.08 | RRP: £8.95
• Man in the Velvet Mask (Doctor Who Missing Adventures) by Daniel O'Mahony Dr Who Paperback 15 February 1996 from£6.73 | RRP: £4.99
• Four Plays by Eugene O'Neill: Beyond the Horizon / the Emperor Jones / Anna Christie / the Hairy Ape by Eugene O'Neill New American Library Mass Market Paperback 26 November 1998 from£4.87 | RRP: £4.5
• Research Methods for Sports Performance Analysis by Peter O'Donoghue Routledge Paperback 14 December 2009 from£33.29 | RRP: £27.99
• The Principles of Astrology by Charles E.O. Carter Astrology Classics Paperback 1 June 2009 from£10.48 | RRP: £15.95
• Into the Heart of Borneo (Vintage departures) by Redmond O'Hanlon Vintage Books Paperback 1 August 1991 from£5.13 | RRP: £3.8
• Focus on First Certificate: Teacher's Book by Sue O'Connell Nelson Paperback 23 September 1996 from£31.32 | RRP: £21.6
• The Far Side of the World by Patrick O'Brian Harper Perennial Paperback 4 June 2007 from£7.89 | RRP: £7.99
• The Science of War: Defense Budgeting, Military Technology, Logistics, and Combat Outcomes by Michael E. O'Hanlon Princeton University Press Hardcover 31 August 2009 from£60.75 | RRP: £24.95
• Keys to First Corinthians: Revisiting the Major Issues by Jerome Murphy-O'Connor OUP Oxford Hardcover 12 February 2009 from£112.60 | RRP: £53
• At Swim-two-birds by Flann O'Brien MacGibbon & K. Hardcover 1 December 1960 from£N/A | RRP: £1.5
• The Xanadu Talisman by Peter O'Donnell Macmillan Paperback 10 December 1982 from£2.02 | RRP: £1.95
• Eden (Abbey Theatre Playscript) (Modern Plays) by Eugene O'Brien Methuen Drama Paperback 8 February 2001 from£12.30 | RRP: £8.99
• Lantern Slides by Edna O'Brien Weidenfeld & Nicolson Hardcover 7 June 1990 from£16.20 | RRP: £12
• The Catalans by Patrick O'Brian HarperCollins Hardcover 5 September 2005 from£22.93 | RRP: £16.99
• Surgeon's Mate (Aubrey-Maturin) by P O'Brian W. W. Norton & Co. Hardcover 26 January 1996 from£22.93 | RRP: £16.99
• The Wine-dark Sea by Patrick O'Brian Harper Perennial Paperback 2 June 2008 from£10.78 | RRP: £7.99
• The Poor Mouth by Flann O'Brien Picador Paperback 19 December 1975 from£1.21 | RRP: £1.75